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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation |
3 | * | |
bc97ce95 | 4 | * Rewrite, cleanup: |
1da177e4 | 5 | * |
91f14480 | 6 | * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation |
bc97ce95 | 7 | * Copyright (C) 2006 Olof Johansson <olof@lixom.net> |
1da177e4 LT |
8 | * |
9 | * Dynamic DMA mapping support, pSeries-specific parts, both SMP and LPAR. | |
10 | * | |
bc97ce95 | 11 | * |
1da177e4 LT |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
bc97ce95 | 16 | * |
1da177e4 LT |
17 | * This program is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
bc97ce95 | 21 | * |
1da177e4 LT |
22 | * You should have received a copy of the GNU General Public License |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | */ | |
26 | ||
1da177e4 LT |
27 | #include <linux/init.h> |
28 | #include <linux/types.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/mm.h> | |
beacc6da | 31 | #include <linux/memblock.h> |
1da177e4 | 32 | #include <linux/spinlock.h> |
62fe91bb | 33 | #include <linux/sched.h> /* for show_stack */ |
1da177e4 LT |
34 | #include <linux/string.h> |
35 | #include <linux/pci.h> | |
36 | #include <linux/dma-mapping.h> | |
62a8bd6c | 37 | #include <linux/crash_dump.h> |
4e8b0cf4 | 38 | #include <linux/memory.h> |
1cf3d8b3 | 39 | #include <linux/of.h> |
1da177e4 LT |
40 | #include <asm/io.h> |
41 | #include <asm/prom.h> | |
42 | #include <asm/rtas.h> | |
1da177e4 LT |
43 | #include <asm/iommu.h> |
44 | #include <asm/pci-bridge.h> | |
45 | #include <asm/machdep.h> | |
1ababe11 | 46 | #include <asm/firmware.h> |
c707ffcf | 47 | #include <asm/tce.h> |
d387899f | 48 | #include <asm/ppc-pci.h> |
2249ca9d | 49 | #include <asm/udbg.h> |
4e8b0cf4 | 50 | #include <asm/mmzone.h> |
1da177e4 | 51 | |
a1218720 ME |
52 | #include "plpar_wrappers.h" |
53 | ||
1da177e4 | 54 | |
8d3d589a MM |
55 | static void tce_invalidate_pSeries_sw(struct iommu_table *tbl, |
56 | u64 *startp, u64 *endp) | |
57 | { | |
58 | u64 __iomem *invalidate = (u64 __iomem *)tbl->it_index; | |
59 | unsigned long start, end, inc; | |
60 | ||
61 | start = __pa(startp); | |
62 | end = __pa(endp); | |
63 | inc = L1_CACHE_BYTES; /* invalidate a cacheline of TCEs at a time */ | |
64 | ||
65 | /* If this is non-zero, change the format. We shift the | |
66 | * address and or in the magic from the device tree. */ | |
67 | if (tbl->it_busno) { | |
68 | start <<= 12; | |
69 | end <<= 12; | |
70 | inc <<= 12; | |
71 | start |= tbl->it_busno; | |
72 | end |= tbl->it_busno; | |
73 | } | |
74 | ||
75 | end |= inc - 1; /* round up end to be different than start */ | |
76 | ||
77 | mb(); /* Make sure TCEs in memory are written */ | |
78 | while (start <= end) { | |
79 | out_be64(invalidate, start); | |
80 | start += inc; | |
81 | } | |
82 | } | |
83 | ||
6490c490 | 84 | static int tce_build_pSeries(struct iommu_table *tbl, long index, |
bc97ce95 | 85 | long npages, unsigned long uaddr, |
4f3dd8a0 MN |
86 | enum dma_data_direction direction, |
87 | struct dma_attrs *attrs) | |
1da177e4 | 88 | { |
bc97ce95 | 89 | u64 proto_tce; |
8d3d589a | 90 | u64 *tcep, *tces; |
bc97ce95 | 91 | u64 rpn; |
1da177e4 | 92 | |
bc97ce95 | 93 | proto_tce = TCE_PCI_READ; // Read allowed |
1da177e4 LT |
94 | |
95 | if (direction != DMA_TO_DEVICE) | |
bc97ce95 | 96 | proto_tce |= TCE_PCI_WRITE; |
1da177e4 | 97 | |
8d3d589a | 98 | tces = tcep = ((u64 *)tbl->it_base) + index; |
1da177e4 LT |
99 | |
100 | while (npages--) { | |
95f72d1e | 101 | /* can't move this out since we might cross MEMBLOCK boundary */ |
474e3d56 | 102 | rpn = __pa(uaddr) >> TCE_SHIFT; |
bc97ce95 | 103 | *tcep = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT; |
1da177e4 | 104 | |
d0035c62 | 105 | uaddr += TCE_PAGE_SIZE; |
bc97ce95 | 106 | tcep++; |
1da177e4 | 107 | } |
8d3d589a | 108 | |
bc6dc752 | 109 | if (tbl->it_type & TCE_PCI_SWINV_CREATE) |
8d3d589a | 110 | tce_invalidate_pSeries_sw(tbl, tces, tcep - 1); |
6490c490 | 111 | return 0; |
1da177e4 LT |
112 | } |
113 | ||
114 | ||
115 | static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages) | |
116 | { | |
8d3d589a | 117 | u64 *tcep, *tces; |
1da177e4 | 118 | |
8d3d589a | 119 | tces = tcep = ((u64 *)tbl->it_base) + index; |
bc97ce95 OJ |
120 | |
121 | while (npages--) | |
122 | *(tcep++) = 0; | |
8d3d589a | 123 | |
bc6dc752 | 124 | if (tbl->it_type & TCE_PCI_SWINV_FREE) |
8d3d589a | 125 | tce_invalidate_pSeries_sw(tbl, tces, tcep - 1); |
1da177e4 LT |
126 | } |
127 | ||
5f50867b HM |
128 | static unsigned long tce_get_pseries(struct iommu_table *tbl, long index) |
129 | { | |
130 | u64 *tcep; | |
131 | ||
5f50867b HM |
132 | tcep = ((u64 *)tbl->it_base) + index; |
133 | ||
134 | return *tcep; | |
135 | } | |
1da177e4 | 136 | |
6490c490 RJ |
137 | static void tce_free_pSeriesLP(struct iommu_table*, long, long); |
138 | static void tce_freemulti_pSeriesLP(struct iommu_table*, long, long); | |
139 | ||
140 | static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum, | |
1da177e4 | 141 | long npages, unsigned long uaddr, |
4f3dd8a0 MN |
142 | enum dma_data_direction direction, |
143 | struct dma_attrs *attrs) | |
1da177e4 | 144 | { |
6490c490 | 145 | u64 rc = 0; |
bc97ce95 OJ |
146 | u64 proto_tce, tce; |
147 | u64 rpn; | |
6490c490 RJ |
148 | int ret = 0; |
149 | long tcenum_start = tcenum, npages_start = npages; | |
1da177e4 | 150 | |
474e3d56 | 151 | rpn = __pa(uaddr) >> TCE_SHIFT; |
bc97ce95 | 152 | proto_tce = TCE_PCI_READ; |
1da177e4 | 153 | if (direction != DMA_TO_DEVICE) |
bc97ce95 | 154 | proto_tce |= TCE_PCI_WRITE; |
1da177e4 LT |
155 | |
156 | while (npages--) { | |
bc97ce95 OJ |
157 | tce = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT; |
158 | rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, tce); | |
159 | ||
6490c490 RJ |
160 | if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) { |
161 | ret = (int)rc; | |
162 | tce_free_pSeriesLP(tbl, tcenum_start, | |
163 | (npages_start - (npages + 1))); | |
164 | break; | |
165 | } | |
166 | ||
1da177e4 | 167 | if (rc && printk_ratelimit()) { |
fe333321 IM |
168 | printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc); |
169 | printk("\tindex = 0x%llx\n", (u64)tbl->it_index); | |
170 | printk("\ttcenum = 0x%llx\n", (u64)tcenum); | |
171 | printk("\ttce val = 0x%llx\n", tce ); | |
1da177e4 LT |
172 | show_stack(current, (unsigned long *)__get_SP()); |
173 | } | |
bc97ce95 | 174 | |
1da177e4 | 175 | tcenum++; |
bc97ce95 | 176 | rpn++; |
1da177e4 | 177 | } |
6490c490 | 178 | return ret; |
1da177e4 LT |
179 | } |
180 | ||
a8daac8a | 181 | static DEFINE_PER_CPU(u64 *, tce_page); |
1da177e4 | 182 | |
6490c490 | 183 | static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum, |
1da177e4 | 184 | long npages, unsigned long uaddr, |
4f3dd8a0 MN |
185 | enum dma_data_direction direction, |
186 | struct dma_attrs *attrs) | |
1da177e4 | 187 | { |
6490c490 | 188 | u64 rc = 0; |
bc97ce95 OJ |
189 | u64 proto_tce; |
190 | u64 *tcep; | |
191 | u64 rpn; | |
1da177e4 | 192 | long l, limit; |
6490c490 RJ |
193 | long tcenum_start = tcenum, npages_start = npages; |
194 | int ret = 0; | |
c1703e85 | 195 | unsigned long flags; |
1da177e4 | 196 | |
541b2755 | 197 | if (npages == 1) { |
6490c490 RJ |
198 | return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr, |
199 | direction, attrs); | |
541b2755 | 200 | } |
1da177e4 | 201 | |
c1703e85 AB |
202 | local_irq_save(flags); /* to protect tcep and the page behind it */ |
203 | ||
1da177e4 LT |
204 | tcep = __get_cpu_var(tce_page); |
205 | ||
206 | /* This is safe to do since interrupts are off when we're called | |
207 | * from iommu_alloc{,_sg}() | |
208 | */ | |
209 | if (!tcep) { | |
bc97ce95 | 210 | tcep = (u64 *)__get_free_page(GFP_ATOMIC); |
1da177e4 | 211 | /* If allocation fails, fall back to the loop implementation */ |
541b2755 | 212 | if (!tcep) { |
c1703e85 | 213 | local_irq_restore(flags); |
6490c490 | 214 | return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr, |
4f3dd8a0 | 215 | direction, attrs); |
541b2755 | 216 | } |
1da177e4 LT |
217 | __get_cpu_var(tce_page) = tcep; |
218 | } | |
219 | ||
474e3d56 | 220 | rpn = __pa(uaddr) >> TCE_SHIFT; |
bc97ce95 | 221 | proto_tce = TCE_PCI_READ; |
1da177e4 | 222 | if (direction != DMA_TO_DEVICE) |
bc97ce95 | 223 | proto_tce |= TCE_PCI_WRITE; |
1da177e4 LT |
224 | |
225 | /* We can map max one pageful of TCEs at a time */ | |
226 | do { | |
227 | /* | |
228 | * Set up the page with TCE data, looping through and setting | |
229 | * the values. | |
230 | */ | |
bc97ce95 | 231 | limit = min_t(long, npages, 4096/TCE_ENTRY_SIZE); |
1da177e4 LT |
232 | |
233 | for (l = 0; l < limit; l++) { | |
bc97ce95 OJ |
234 | tcep[l] = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT; |
235 | rpn++; | |
1da177e4 LT |
236 | } |
237 | ||
238 | rc = plpar_tce_put_indirect((u64)tbl->it_index, | |
239 | (u64)tcenum << 12, | |
474e3d56 | 240 | (u64)__pa(tcep), |
1da177e4 LT |
241 | limit); |
242 | ||
243 | npages -= limit; | |
244 | tcenum += limit; | |
245 | } while (npages > 0 && !rc); | |
246 | ||
c1703e85 AB |
247 | local_irq_restore(flags); |
248 | ||
6490c490 RJ |
249 | if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) { |
250 | ret = (int)rc; | |
251 | tce_freemulti_pSeriesLP(tbl, tcenum_start, | |
252 | (npages_start - (npages + limit))); | |
253 | return ret; | |
254 | } | |
255 | ||
1da177e4 | 256 | if (rc && printk_ratelimit()) { |
fe333321 IM |
257 | printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc); |
258 | printk("\tindex = 0x%llx\n", (u64)tbl->it_index); | |
259 | printk("\tnpages = 0x%llx\n", (u64)npages); | |
260 | printk("\ttce[0] val = 0x%llx\n", tcep[0]); | |
1da177e4 LT |
261 | show_stack(current, (unsigned long *)__get_SP()); |
262 | } | |
6490c490 | 263 | return ret; |
1da177e4 LT |
264 | } |
265 | ||
266 | static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages) | |
267 | { | |
268 | u64 rc; | |
1da177e4 | 269 | |
1da177e4 | 270 | while (npages--) { |
bc97ce95 | 271 | rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, 0); |
1da177e4 LT |
272 | |
273 | if (rc && printk_ratelimit()) { | |
fe333321 IM |
274 | printk("tce_free_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc); |
275 | printk("\tindex = 0x%llx\n", (u64)tbl->it_index); | |
276 | printk("\ttcenum = 0x%llx\n", (u64)tcenum); | |
1da177e4 LT |
277 | show_stack(current, (unsigned long *)__get_SP()); |
278 | } | |
279 | ||
280 | tcenum++; | |
281 | } | |
282 | } | |
283 | ||
284 | ||
285 | static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages) | |
286 | { | |
287 | u64 rc; | |
1da177e4 | 288 | |
bc97ce95 | 289 | rc = plpar_tce_stuff((u64)tbl->it_index, (u64)tcenum << 12, 0, npages); |
1da177e4 LT |
290 | |
291 | if (rc && printk_ratelimit()) { | |
292 | printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n"); | |
fe333321 IM |
293 | printk("\trc = %lld\n", rc); |
294 | printk("\tindex = 0x%llx\n", (u64)tbl->it_index); | |
295 | printk("\tnpages = 0x%llx\n", (u64)npages); | |
1da177e4 LT |
296 | show_stack(current, (unsigned long *)__get_SP()); |
297 | } | |
298 | } | |
299 | ||
5f50867b HM |
300 | static unsigned long tce_get_pSeriesLP(struct iommu_table *tbl, long tcenum) |
301 | { | |
302 | u64 rc; | |
303 | unsigned long tce_ret; | |
304 | ||
5f50867b HM |
305 | rc = plpar_tce_get((u64)tbl->it_index, (u64)tcenum << 12, &tce_ret); |
306 | ||
307 | if (rc && printk_ratelimit()) { | |
fe333321 IM |
308 | printk("tce_get_pSeriesLP: plpar_tce_get failed. rc=%lld\n", rc); |
309 | printk("\tindex = 0x%llx\n", (u64)tbl->it_index); | |
310 | printk("\ttcenum = 0x%llx\n", (u64)tcenum); | |
5f50867b HM |
311 | show_stack(current, (unsigned long *)__get_SP()); |
312 | } | |
313 | ||
314 | return tce_ret; | |
315 | } | |
316 | ||
25985edc | 317 | /* this is compatible with cells for the device tree property */ |
4e8b0cf4 NA |
318 | struct dynamic_dma_window_prop { |
319 | __be32 liobn; /* tce table number */ | |
320 | __be64 dma_base; /* address hi,lo */ | |
321 | __be32 tce_shift; /* ilog2(tce_page_size) */ | |
322 | __be32 window_shift; /* ilog2(tce_window_size) */ | |
323 | }; | |
324 | ||
325 | struct direct_window { | |
326 | struct device_node *device; | |
327 | const struct dynamic_dma_window_prop *prop; | |
328 | struct list_head list; | |
329 | }; | |
330 | ||
331 | /* Dynamic DMA Window support */ | |
332 | struct ddw_query_response { | |
333 | u32 windows_available; | |
334 | u32 largest_available_block; | |
335 | u32 page_size; | |
336 | u32 migration_capable; | |
337 | }; | |
338 | ||
339 | struct ddw_create_response { | |
340 | u32 liobn; | |
341 | u32 addr_hi; | |
342 | u32 addr_lo; | |
343 | }; | |
344 | ||
345 | static LIST_HEAD(direct_window_list); | |
346 | /* prevents races between memory on/offline and window creation */ | |
347 | static DEFINE_SPINLOCK(direct_window_list_lock); | |
348 | /* protects initializing window twice for same device */ | |
349 | static DEFINE_MUTEX(direct_window_init_mutex); | |
350 | #define DIRECT64_PROPNAME "linux,direct64-ddr-window-info" | |
351 | ||
352 | static int tce_clearrange_multi_pSeriesLP(unsigned long start_pfn, | |
353 | unsigned long num_pfn, const void *arg) | |
354 | { | |
355 | const struct dynamic_dma_window_prop *maprange = arg; | |
356 | int rc; | |
357 | u64 tce_size, num_tce, dma_offset, next; | |
358 | u32 tce_shift; | |
359 | long limit; | |
360 | ||
361 | tce_shift = be32_to_cpu(maprange->tce_shift); | |
362 | tce_size = 1ULL << tce_shift; | |
363 | next = start_pfn << PAGE_SHIFT; | |
364 | num_tce = num_pfn << PAGE_SHIFT; | |
365 | ||
366 | /* round back to the beginning of the tce page size */ | |
367 | num_tce += next & (tce_size - 1); | |
368 | next &= ~(tce_size - 1); | |
369 | ||
370 | /* covert to number of tces */ | |
371 | num_tce |= tce_size - 1; | |
372 | num_tce >>= tce_shift; | |
373 | ||
374 | do { | |
375 | /* | |
376 | * Set up the page with TCE data, looping through and setting | |
377 | * the values. | |
378 | */ | |
379 | limit = min_t(long, num_tce, 512); | |
380 | dma_offset = next + be64_to_cpu(maprange->dma_base); | |
381 | ||
382 | rc = plpar_tce_stuff((u64)be32_to_cpu(maprange->liobn), | |
383 | dma_offset, | |
384 | 0, limit); | |
22b38298 | 385 | next += limit * tce_size; |
4e8b0cf4 NA |
386 | num_tce -= limit; |
387 | } while (num_tce > 0 && !rc); | |
388 | ||
389 | return rc; | |
390 | } | |
391 | ||
392 | static int tce_setrange_multi_pSeriesLP(unsigned long start_pfn, | |
393 | unsigned long num_pfn, const void *arg) | |
394 | { | |
395 | const struct dynamic_dma_window_prop *maprange = arg; | |
396 | u64 *tcep, tce_size, num_tce, dma_offset, next, proto_tce, liobn; | |
397 | u32 tce_shift; | |
398 | u64 rc = 0; | |
399 | long l, limit; | |
400 | ||
401 | local_irq_disable(); /* to protect tcep and the page behind it */ | |
402 | tcep = __get_cpu_var(tce_page); | |
403 | ||
404 | if (!tcep) { | |
405 | tcep = (u64 *)__get_free_page(GFP_ATOMIC); | |
406 | if (!tcep) { | |
407 | local_irq_enable(); | |
408 | return -ENOMEM; | |
409 | } | |
410 | __get_cpu_var(tce_page) = tcep; | |
411 | } | |
412 | ||
413 | proto_tce = TCE_PCI_READ | TCE_PCI_WRITE; | |
414 | ||
415 | liobn = (u64)be32_to_cpu(maprange->liobn); | |
416 | tce_shift = be32_to_cpu(maprange->tce_shift); | |
417 | tce_size = 1ULL << tce_shift; | |
418 | next = start_pfn << PAGE_SHIFT; | |
419 | num_tce = num_pfn << PAGE_SHIFT; | |
420 | ||
421 | /* round back to the beginning of the tce page size */ | |
422 | num_tce += next & (tce_size - 1); | |
423 | next &= ~(tce_size - 1); | |
424 | ||
425 | /* covert to number of tces */ | |
426 | num_tce |= tce_size - 1; | |
427 | num_tce >>= tce_shift; | |
428 | ||
429 | /* We can map max one pageful of TCEs at a time */ | |
430 | do { | |
431 | /* | |
432 | * Set up the page with TCE data, looping through and setting | |
433 | * the values. | |
434 | */ | |
435 | limit = min_t(long, num_tce, 4096/TCE_ENTRY_SIZE); | |
436 | dma_offset = next + be64_to_cpu(maprange->dma_base); | |
437 | ||
438 | for (l = 0; l < limit; l++) { | |
439 | tcep[l] = proto_tce | next; | |
440 | next += tce_size; | |
441 | } | |
442 | ||
443 | rc = plpar_tce_put_indirect(liobn, | |
444 | dma_offset, | |
474e3d56 | 445 | (u64)__pa(tcep), |
4e8b0cf4 NA |
446 | limit); |
447 | ||
448 | num_tce -= limit; | |
449 | } while (num_tce > 0 && !rc); | |
450 | ||
451 | /* error cleanup: caller will clear whole range */ | |
452 | ||
453 | local_irq_enable(); | |
454 | return rc; | |
455 | } | |
456 | ||
457 | static int tce_setrange_multi_pSeriesLP_walk(unsigned long start_pfn, | |
458 | unsigned long num_pfn, void *arg) | |
459 | { | |
460 | return tce_setrange_multi_pSeriesLP(start_pfn, num_pfn, arg); | |
461 | } | |
462 | ||
463 | ||
bed59275 | 464 | #ifdef CONFIG_PCI |
1da177e4 LT |
465 | static void iommu_table_setparms(struct pci_controller *phb, |
466 | struct device_node *dn, | |
bc97ce95 | 467 | struct iommu_table *tbl) |
1da177e4 LT |
468 | { |
469 | struct device_node *node; | |
8d3d589a | 470 | const unsigned long *basep, *sw_inval; |
9938c474 | 471 | const u32 *sizep; |
1da177e4 | 472 | |
44ef3390 | 473 | node = phb->dn; |
1da177e4 | 474 | |
e2eb6392 SR |
475 | basep = of_get_property(node, "linux,tce-base", NULL); |
476 | sizep = of_get_property(node, "linux,tce-size", NULL); | |
1da177e4 LT |
477 | if (basep == NULL || sizep == NULL) { |
478 | printk(KERN_ERR "PCI_DMA: iommu_table_setparms: %s has " | |
479 | "missing tce entries !\n", dn->full_name); | |
480 | return; | |
481 | } | |
482 | ||
483 | tbl->it_base = (unsigned long)__va(*basep); | |
5f50867b | 484 | |
62a8bd6c | 485 | if (!is_kdump_kernel()) |
54622f10 | 486 | memset((void *)tbl->it_base, 0, *sizep); |
1da177e4 LT |
487 | |
488 | tbl->it_busno = phb->bus->number; | |
bc97ce95 | 489 | |
1da177e4 | 490 | /* Units of tce entries */ |
5d2efba6 | 491 | tbl->it_offset = phb->dma_window_base_cur >> IOMMU_PAGE_SHIFT; |
bc97ce95 | 492 | |
1da177e4 | 493 | /* Test if we are going over 2GB of DMA space */ |
3c2822cc OJ |
494 | if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) { |
495 | udbg_printf("PCI_DMA: Unexpected number of IOAs under this PHB.\n"); | |
bc97ce95 | 496 | panic("PCI_DMA: Unexpected number of IOAs under this PHB.\n"); |
3c2822cc | 497 | } |
bc97ce95 | 498 | |
1da177e4 LT |
499 | phb->dma_window_base_cur += phb->dma_window_size; |
500 | ||
501 | /* Set the tce table size - measured in entries */ | |
5d2efba6 | 502 | tbl->it_size = phb->dma_window_size >> IOMMU_PAGE_SHIFT; |
1da177e4 LT |
503 | |
504 | tbl->it_index = 0; | |
505 | tbl->it_blocksize = 16; | |
506 | tbl->it_type = TCE_PCI; | |
8d3d589a MM |
507 | |
508 | sw_inval = of_get_property(node, "linux,tce-sw-invalidate-info", NULL); | |
509 | if (sw_inval) { | |
510 | /* | |
511 | * This property contains information on how to | |
512 | * invalidate the TCE entry. The first property is | |
513 | * the base MMIO address used to invalidate entries. | |
514 | * The second property tells us the format of the TCE | |
515 | * invalidate (whether it needs to be shifted) and | |
516 | * some magic routing info to add to our invalidate | |
517 | * command. | |
518 | */ | |
519 | tbl->it_index = (unsigned long) ioremap(sw_inval[0], 8); | |
520 | tbl->it_busno = sw_inval[1]; /* overload this with magic */ | |
1f1616e8 | 521 | tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE; |
8d3d589a | 522 | } |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * iommu_table_setparms_lpar | |
527 | * | |
528 | * Function: On pSeries LPAR systems, return TCE table info, given a pci bus. | |
1da177e4 LT |
529 | */ |
530 | static void iommu_table_setparms_lpar(struct pci_controller *phb, | |
531 | struct device_node *dn, | |
532 | struct iommu_table *tbl, | |
b8c49def | 533 | const void *dma_window) |
1da177e4 | 534 | { |
4c76e0bc JK |
535 | unsigned long offset, size; |
536 | ||
4c76e0bc | 537 | of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size); |
1da177e4 | 538 | |
b8c49def | 539 | tbl->it_busno = phb->bus->number; |
1da177e4 | 540 | tbl->it_base = 0; |
1da177e4 LT |
541 | tbl->it_blocksize = 16; |
542 | tbl->it_type = TCE_PCI; | |
5d2efba6 LV |
543 | tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; |
544 | tbl->it_size = size >> IOMMU_PAGE_SHIFT; | |
1da177e4 LT |
545 | } |
546 | ||
12d04eef | 547 | static void pci_dma_bus_setup_pSeries(struct pci_bus *bus) |
1da177e4 | 548 | { |
3c2822cc | 549 | struct device_node *dn; |
1da177e4 | 550 | struct iommu_table *tbl; |
3c2822cc OJ |
551 | struct device_node *isa_dn, *isa_dn_orig; |
552 | struct device_node *tmp; | |
553 | struct pci_dn *pci; | |
554 | int children; | |
1da177e4 | 555 | |
3c2822cc | 556 | dn = pci_bus_to_OF_node(bus); |
12d04eef | 557 | |
f7ebf352 | 558 | pr_debug("pci_dma_bus_setup_pSeries: setting up bus %s\n", dn->full_name); |
3c2822cc OJ |
559 | |
560 | if (bus->self) { | |
561 | /* This is not a root bus, any setup will be done for the | |
562 | * device-side of the bridge in iommu_dev_setup_pSeries(). | |
563 | */ | |
564 | return; | |
565 | } | |
12d04eef | 566 | pci = PCI_DN(dn); |
3c2822cc OJ |
567 | |
568 | /* Check if the ISA bus on the system is under | |
569 | * this PHB. | |
1da177e4 | 570 | */ |
3c2822cc | 571 | isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa"); |
1da177e4 | 572 | |
3c2822cc OJ |
573 | while (isa_dn && isa_dn != dn) |
574 | isa_dn = isa_dn->parent; | |
575 | ||
576 | if (isa_dn_orig) | |
577 | of_node_put(isa_dn_orig); | |
1da177e4 | 578 | |
d3c58fb1 | 579 | /* Count number of direct PCI children of the PHB. */ |
3c2822cc | 580 | for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling) |
d3c58fb1 | 581 | children++; |
1da177e4 | 582 | |
f7ebf352 | 583 | pr_debug("Children: %d\n", children); |
1da177e4 | 584 | |
3c2822cc OJ |
585 | /* Calculate amount of DMA window per slot. Each window must be |
586 | * a power of two (due to pci_alloc_consistent requirements). | |
587 | * | |
588 | * Keep 256MB aside for PHBs with ISA. | |
589 | */ | |
1da177e4 | 590 | |
3c2822cc OJ |
591 | if (!isa_dn) { |
592 | /* No ISA/IDE - just set window size and return */ | |
593 | pci->phb->dma_window_size = 0x80000000ul; /* To be divided */ | |
594 | ||
595 | while (pci->phb->dma_window_size * children > 0x80000000ul) | |
596 | pci->phb->dma_window_size >>= 1; | |
41febbc8 | 597 | pr_debug("No ISA/IDE, window size is 0x%llx\n", |
f7ebf352 | 598 | pci->phb->dma_window_size); |
3c2822cc OJ |
599 | pci->phb->dma_window_base_cur = 0; |
600 | ||
601 | return; | |
1da177e4 | 602 | } |
3c2822cc OJ |
603 | |
604 | /* If we have ISA, then we probably have an IDE | |
605 | * controller too. Allocate a 128MB table but | |
606 | * skip the first 128MB to avoid stepping on ISA | |
607 | * space. | |
608 | */ | |
609 | pci->phb->dma_window_size = 0x8000000ul; | |
610 | pci->phb->dma_window_base_cur = 0x8000000ul; | |
611 | ||
7aa241fd | 612 | tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, |
ca1588e7 | 613 | pci->phb->node); |
3c2822cc OJ |
614 | |
615 | iommu_table_setparms(pci->phb, dn, tbl); | |
ca1588e7 | 616 | pci->iommu_table = iommu_init_table(tbl, pci->phb->node); |
3c2822cc OJ |
617 | |
618 | /* Divide the rest (1.75GB) among the children */ | |
619 | pci->phb->dma_window_size = 0x80000000ul; | |
620 | while (pci->phb->dma_window_size * children > 0x70000000ul) | |
621 | pci->phb->dma_window_size >>= 1; | |
622 | ||
41febbc8 | 623 | pr_debug("ISA/IDE, window size is 0x%llx\n", pci->phb->dma_window_size); |
1da177e4 LT |
624 | } |
625 | ||
626 | ||
12d04eef | 627 | static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus) |
1da177e4 LT |
628 | { |
629 | struct iommu_table *tbl; | |
630 | struct device_node *dn, *pdn; | |
1635317f | 631 | struct pci_dn *ppci; |
954a46e2 | 632 | const void *dma_window = NULL; |
1da177e4 | 633 | |
1da177e4 LT |
634 | dn = pci_bus_to_OF_node(bus); |
635 | ||
f7ebf352 ME |
636 | pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %s\n", |
637 | dn->full_name); | |
12d04eef | 638 | |
1da177e4 LT |
639 | /* Find nearest ibm,dma-window, walking up the device tree */ |
640 | for (pdn = dn; pdn != NULL; pdn = pdn->parent) { | |
e2eb6392 | 641 | dma_window = of_get_property(pdn, "ibm,dma-window", NULL); |
1da177e4 LT |
642 | if (dma_window != NULL) |
643 | break; | |
644 | } | |
645 | ||
646 | if (dma_window == NULL) { | |
f7ebf352 | 647 | pr_debug(" no ibm,dma-window property !\n"); |
1da177e4 LT |
648 | return; |
649 | } | |
650 | ||
e07102db | 651 | ppci = PCI_DN(pdn); |
12d04eef | 652 | |
f7ebf352 ME |
653 | pr_debug(" parent is %s, iommu_table: 0x%p\n", |
654 | pdn->full_name, ppci->iommu_table); | |
12d04eef | 655 | |
1635317f | 656 | if (!ppci->iommu_table) { |
7aa241fd | 657 | tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, |
ca1588e7 | 658 | ppci->phb->node); |
b8c49def | 659 | iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window); |
ca1588e7 | 660 | ppci->iommu_table = iommu_init_table(tbl, ppci->phb->node); |
f7ebf352 | 661 | pr_debug(" created table: %p\n", ppci->iommu_table); |
1da177e4 | 662 | } |
1da177e4 LT |
663 | } |
664 | ||
665 | ||
12d04eef | 666 | static void pci_dma_dev_setup_pSeries(struct pci_dev *dev) |
1da177e4 | 667 | { |
12d04eef | 668 | struct device_node *dn; |
3c2822cc | 669 | struct iommu_table *tbl; |
1da177e4 | 670 | |
f7ebf352 | 671 | pr_debug("pci_dma_dev_setup_pSeries: %s\n", pci_name(dev)); |
1da177e4 | 672 | |
58f9b0b0 | 673 | dn = dev->dev.of_node; |
1da177e4 | 674 | |
3c2822cc OJ |
675 | /* If we're the direct child of a root bus, then we need to allocate |
676 | * an iommu table ourselves. The bus setup code should have setup | |
677 | * the window sizes already. | |
678 | */ | |
679 | if (!dev->bus->self) { | |
12d04eef BH |
680 | struct pci_controller *phb = PCI_DN(dn)->phb; |
681 | ||
f7ebf352 | 682 | pr_debug(" --> first child, no bridge. Allocating iommu table.\n"); |
7aa241fd | 683 | tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, |
12d04eef BH |
684 | phb->node); |
685 | iommu_table_setparms(phb, dn, tbl); | |
77319254 | 686 | PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node); |
738ef42e | 687 | set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table); |
3c2822cc OJ |
688 | return; |
689 | } | |
690 | ||
691 | /* If this device is further down the bus tree, search upwards until | |
692 | * an already allocated iommu table is found and use that. | |
693 | */ | |
694 | ||
e07102db | 695 | while (dn && PCI_DN(dn) && PCI_DN(dn)->iommu_table == NULL) |
1da177e4 LT |
696 | dn = dn->parent; |
697 | ||
12d04eef | 698 | if (dn && PCI_DN(dn)) |
738ef42e | 699 | set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table); |
12d04eef BH |
700 | else |
701 | printk(KERN_WARNING "iommu: Device %s has no iommu table\n", | |
702 | pci_name(dev)); | |
1da177e4 LT |
703 | } |
704 | ||
4e8b0cf4 NA |
705 | static int __read_mostly disable_ddw; |
706 | ||
707 | static int __init disable_ddw_setup(char *str) | |
708 | { | |
709 | disable_ddw = 1; | |
710 | printk(KERN_INFO "ppc iommu: disabling ddw.\n"); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | early_param("disable_ddw", disable_ddw_setup); | |
716 | ||
25ebc45b NA |
717 | static inline void __remove_ddw(struct device_node *np, const u32 *ddw_avail, u64 liobn) |
718 | { | |
719 | int ret; | |
720 | ||
721 | ret = rtas_call(ddw_avail[2], 1, 1, NULL, liobn); | |
722 | if (ret) | |
723 | pr_warning("%s: failed to remove DMA window: rtas returned " | |
724 | "%d to ibm,remove-pe-dma-window(%x) %llx\n", | |
725 | np->full_name, ret, ddw_avail[2], liobn); | |
726 | else | |
727 | pr_debug("%s: successfully removed DMA window: rtas returned " | |
728 | "%d to ibm,remove-pe-dma-window(%x) %llx\n", | |
729 | np->full_name, ret, ddw_avail[2], liobn); | |
730 | } | |
731 | ||
4e8b0cf4 NA |
732 | static void remove_ddw(struct device_node *np) |
733 | { | |
734 | struct dynamic_dma_window_prop *dwp; | |
735 | struct property *win64; | |
b73a635f | 736 | const u32 *ddw_avail; |
4e8b0cf4 NA |
737 | u64 liobn; |
738 | int len, ret; | |
739 | ||
b73a635f | 740 | ddw_avail = of_get_property(np, "ibm,ddw-applicable", &len); |
4e8b0cf4 | 741 | win64 = of_find_property(np, DIRECT64_PROPNAME, NULL); |
2573f684 | 742 | if (!win64) |
4e8b0cf4 NA |
743 | return; |
744 | ||
b73a635f | 745 | if (!ddw_avail || len < 3 * sizeof(u32) || win64->length < sizeof(*dwp)) |
2573f684 MM |
746 | goto delprop; |
747 | ||
4e8b0cf4 NA |
748 | dwp = win64->value; |
749 | liobn = (u64)be32_to_cpu(dwp->liobn); | |
750 | ||
751 | /* clear the whole window, note the arg is in kernel pages */ | |
752 | ret = tce_clearrange_multi_pSeriesLP(0, | |
753 | 1ULL << (be32_to_cpu(dwp->window_shift) - PAGE_SHIFT), dwp); | |
754 | if (ret) | |
755 | pr_warning("%s failed to clear tces in window.\n", | |
756 | np->full_name); | |
757 | else | |
758 | pr_debug("%s successfully cleared tces in window.\n", | |
759 | np->full_name); | |
760 | ||
25ebc45b | 761 | __remove_ddw(np, ddw_avail, liobn); |
4e8b0cf4 | 762 | |
2573f684 | 763 | delprop: |
79d1c712 | 764 | ret = of_remove_property(np, win64); |
2573f684 | 765 | if (ret) |
c8566780 | 766 | pr_warning("%s: failed to remove direct window property: %d\n", |
2573f684 MM |
767 | np->full_name, ret); |
768 | } | |
4e8b0cf4 | 769 | |
b73a635f | 770 | static u64 find_existing_ddw(struct device_node *pdn) |
4e8b0cf4 | 771 | { |
4e8b0cf4 NA |
772 | struct direct_window *window; |
773 | const struct dynamic_dma_window_prop *direct64; | |
774 | u64 dma_addr = 0; | |
775 | ||
4e8b0cf4 NA |
776 | spin_lock(&direct_window_list_lock); |
777 | /* check if we already created a window and dupe that config if so */ | |
778 | list_for_each_entry(window, &direct_window_list, list) { | |
779 | if (window->device == pdn) { | |
780 | direct64 = window->prop; | |
781 | dma_addr = direct64->dma_base; | |
782 | break; | |
783 | } | |
784 | } | |
785 | spin_unlock(&direct_window_list_lock); | |
786 | ||
787 | return dma_addr; | |
788 | } | |
789 | ||
14b6f00f NA |
790 | static void __restore_default_window(struct eeh_dev *edev, |
791 | u32 ddw_restore_token) | |
792 | { | |
793 | u32 cfg_addr; | |
794 | u64 buid; | |
795 | int ret; | |
796 | ||
797 | /* | |
798 | * Get the config address and phb buid of the PE window. | |
799 | * Rely on eeh to retrieve this for us. | |
800 | * Retrieve them from the pci device, not the node with the | |
801 | * dma-window property | |
802 | */ | |
803 | cfg_addr = edev->config_addr; | |
804 | if (edev->pe_config_addr) | |
805 | cfg_addr = edev->pe_config_addr; | |
806 | buid = edev->phb->buid; | |
807 | ||
808 | do { | |
809 | ret = rtas_call(ddw_restore_token, 3, 1, NULL, cfg_addr, | |
810 | BUID_HI(buid), BUID_LO(buid)); | |
811 | } while (rtas_busy_delay(ret)); | |
812 | pr_info("ibm,reset-pe-dma-windows(%x) %x %x %x returned %d\n", | |
813 | ddw_restore_token, cfg_addr, BUID_HI(buid), BUID_LO(buid), ret); | |
814 | } | |
815 | ||
c8566780 | 816 | static int find_existing_ddw_windows(void) |
4e8b0cf4 | 817 | { |
c8566780 | 818 | struct device_node *pdn; |
4e8b0cf4 | 819 | const struct dynamic_dma_window_prop *direct64; |
14b6f00f | 820 | const u32 *ddw_extensions; |
4e8b0cf4 | 821 | |
c8566780 MM |
822 | if (!firmware_has_feature(FW_FEATURE_LPAR)) |
823 | return 0; | |
824 | ||
825 | for_each_node_with_property(pdn, DIRECT64_PROPNAME) { | |
14b6f00f | 826 | direct64 = of_get_property(pdn, DIRECT64_PROPNAME, NULL); |
c8566780 MM |
827 | if (!direct64) |
828 | continue; | |
829 | ||
14b6f00f NA |
830 | /* |
831 | * We need to ensure the IOMMU table is active when we | |
832 | * return from the IOMMU setup so that the common code | |
833 | * can clear the table or find the holes. To that end, | |
834 | * first, remove any existing DDW configuration. | |
835 | */ | |
836 | remove_ddw(pdn); | |
c8566780 | 837 | |
14b6f00f NA |
838 | /* |
839 | * Second, if we are running on a new enough level of | |
840 | * firmware where the restore API is present, use it to | |
841 | * restore the 32-bit window, which was removed in | |
842 | * create_ddw. | |
843 | * If the API is not present, then create_ddw couldn't | |
844 | * have removed the 32-bit window in the first place, so | |
845 | * removing the DDW configuration should be sufficient. | |
846 | */ | |
847 | ddw_extensions = of_get_property(pdn, "ibm,ddw-extensions", | |
848 | NULL); | |
849 | if (ddw_extensions && ddw_extensions[0] > 0) | |
850 | __restore_default_window(of_node_to_eeh_dev(pdn), | |
851 | ddw_extensions[1]); | |
4e8b0cf4 NA |
852 | } |
853 | ||
c8566780 | 854 | return 0; |
4e8b0cf4 | 855 | } |
c8566780 | 856 | machine_arch_initcall(pseries, find_existing_ddw_windows); |
4e8b0cf4 | 857 | |
b73a635f | 858 | static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail, |
4e8b0cf4 NA |
859 | struct ddw_query_response *query) |
860 | { | |
39baadbf | 861 | struct eeh_dev *edev; |
4e8b0cf4 NA |
862 | u32 cfg_addr; |
863 | u64 buid; | |
864 | int ret; | |
865 | ||
866 | /* | |
867 | * Get the config address and phb buid of the PE window. | |
868 | * Rely on eeh to retrieve this for us. | |
869 | * Retrieve them from the pci device, not the node with the | |
870 | * dma-window property | |
871 | */ | |
39baadbf GS |
872 | edev = pci_dev_to_eeh_dev(dev); |
873 | cfg_addr = edev->config_addr; | |
874 | if (edev->pe_config_addr) | |
875 | cfg_addr = edev->pe_config_addr; | |
876 | buid = edev->phb->buid; | |
877 | ||
b73a635f | 878 | ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query, |
4e8b0cf4 NA |
879 | cfg_addr, BUID_HI(buid), BUID_LO(buid)); |
880 | dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x" | |
b73a635f | 881 | " returned %d\n", ddw_avail[0], cfg_addr, BUID_HI(buid), |
4e8b0cf4 NA |
882 | BUID_LO(buid), ret); |
883 | return ret; | |
884 | } | |
885 | ||
b73a635f | 886 | static int create_ddw(struct pci_dev *dev, const u32 *ddw_avail, |
4e8b0cf4 NA |
887 | struct ddw_create_response *create, int page_shift, |
888 | int window_shift) | |
889 | { | |
39baadbf | 890 | struct eeh_dev *edev; |
4e8b0cf4 NA |
891 | u32 cfg_addr; |
892 | u64 buid; | |
893 | int ret; | |
894 | ||
895 | /* | |
896 | * Get the config address and phb buid of the PE window. | |
897 | * Rely on eeh to retrieve this for us. | |
898 | * Retrieve them from the pci device, not the node with the | |
899 | * dma-window property | |
900 | */ | |
39baadbf GS |
901 | edev = pci_dev_to_eeh_dev(dev); |
902 | cfg_addr = edev->config_addr; | |
903 | if (edev->pe_config_addr) | |
904 | cfg_addr = edev->pe_config_addr; | |
905 | buid = edev->phb->buid; | |
4e8b0cf4 NA |
906 | |
907 | do { | |
908 | /* extra outputs are LIOBN and dma-addr (hi, lo) */ | |
b73a635f | 909 | ret = rtas_call(ddw_avail[1], 5, 4, (u32 *)create, cfg_addr, |
4e8b0cf4 NA |
910 | BUID_HI(buid), BUID_LO(buid), page_shift, window_shift); |
911 | } while (rtas_busy_delay(ret)); | |
912 | dev_info(&dev->dev, | |
913 | "ibm,create-pe-dma-window(%x) %x %x %x %x %x returned %d " | |
b73a635f | 914 | "(liobn = 0x%x starting addr = %x %x)\n", ddw_avail[1], |
4e8b0cf4 NA |
915 | cfg_addr, BUID_HI(buid), BUID_LO(buid), page_shift, |
916 | window_shift, ret, create->liobn, create->addr_hi, create->addr_lo); | |
917 | ||
918 | return ret; | |
919 | } | |
920 | ||
25ebc45b | 921 | static void restore_default_window(struct pci_dev *dev, |
a1dabade | 922 | u32 ddw_restore_token) |
25ebc45b | 923 | { |
14b6f00f | 924 | __restore_default_window(pci_dev_to_eeh_dev(dev), ddw_restore_token); |
25ebc45b NA |
925 | } |
926 | ||
4e8b0cf4 NA |
927 | /* |
928 | * If the PE supports dynamic dma windows, and there is space for a table | |
929 | * that can map all pages in a linear offset, then setup such a table, | |
930 | * and record the dma-offset in the struct device. | |
931 | * | |
932 | * dev: the pci device we are checking | |
933 | * pdn: the parent pe node with the ibm,dma_window property | |
934 | * Future: also check if we can remap the base window for our base page size | |
935 | * | |
936 | * returns the dma offset for use by dma_set_mask | |
937 | */ | |
938 | static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn) | |
939 | { | |
940 | int len, ret; | |
941 | struct ddw_query_response query; | |
942 | struct ddw_create_response create; | |
943 | int page_shift; | |
944 | u64 dma_addr, max_addr; | |
945 | struct device_node *dn; | |
b73a635f | 946 | const u32 *uninitialized_var(ddw_avail); |
25ebc45b NA |
947 | const u32 *uninitialized_var(ddw_extensions); |
948 | u32 ddw_restore_token = 0; | |
4e8b0cf4 | 949 | struct direct_window *window; |
76730334 | 950 | struct property *win64; |
4e8b0cf4 | 951 | struct dynamic_dma_window_prop *ddwprop; |
25ebc45b NA |
952 | const void *dma_window = NULL; |
953 | unsigned long liobn, offset, size; | |
4e8b0cf4 NA |
954 | |
955 | mutex_lock(&direct_window_init_mutex); | |
956 | ||
b73a635f | 957 | dma_addr = find_existing_ddw(pdn); |
4e8b0cf4 NA |
958 | if (dma_addr != 0) |
959 | goto out_unlock; | |
960 | ||
4e8b0cf4 NA |
961 | /* |
962 | * the ibm,ddw-applicable property holds the tokens for: | |
963 | * ibm,query-pe-dma-window | |
964 | * ibm,create-pe-dma-window | |
965 | * ibm,remove-pe-dma-window | |
966 | * for the given node in that order. | |
967 | * the property is actually in the parent, not the PE | |
968 | */ | |
b73a635f MM |
969 | ddw_avail = of_get_property(pdn, "ibm,ddw-applicable", &len); |
970 | if (!ddw_avail || len < 3 * sizeof(u32)) | |
4e8b0cf4 NA |
971 | goto out_unlock; |
972 | ||
25ebc45b NA |
973 | /* |
974 | * the extensions property is only required to exist in certain | |
975 | * levels of firmware and later | |
976 | * the ibm,ddw-extensions property is a list with the first | |
977 | * element containing the number of extensions and each | |
978 | * subsequent entry is a value corresponding to that extension | |
979 | */ | |
980 | ddw_extensions = of_get_property(pdn, "ibm,ddw-extensions", &len); | |
981 | if (ddw_extensions) { | |
982 | /* | |
983 | * each new defined extension length should be added to | |
984 | * the top of the switch so the "earlier" entries also | |
985 | * get picked up | |
986 | */ | |
987 | switch (ddw_extensions[0]) { | |
988 | /* ibm,reset-pe-dma-windows */ | |
989 | case 1: | |
990 | ddw_restore_token = ddw_extensions[1]; | |
991 | break; | |
992 | } | |
993 | } | |
994 | ||
995 | /* | |
996 | * Only remove the existing DMA window if we can restore back to | |
997 | * the default state. Removing the existing window maximizes the | |
998 | * resources available to firmware for dynamic window creation. | |
999 | */ | |
1000 | if (ddw_restore_token) { | |
1001 | dma_window = of_get_property(pdn, "ibm,dma-window", NULL); | |
1002 | of_parse_dma_window(pdn, dma_window, &liobn, &offset, &size); | |
1003 | __remove_ddw(pdn, ddw_avail, liobn); | |
1004 | } | |
1005 | ||
1006 | /* | |
4e8b0cf4 NA |
1007 | * Query if there is a second window of size to map the |
1008 | * whole partition. Query returns number of windows, largest | |
1009 | * block assigned to PE (partition endpoint), and two bitmasks | |
1010 | * of page sizes: supported and supported for migrate-dma. | |
1011 | */ | |
1012 | dn = pci_device_to_OF_node(dev); | |
b73a635f | 1013 | ret = query_ddw(dev, ddw_avail, &query); |
4e8b0cf4 | 1014 | if (ret != 0) |
25ebc45b | 1015 | goto out_restore_window; |
4e8b0cf4 NA |
1016 | |
1017 | if (query.windows_available == 0) { | |
1018 | /* | |
1019 | * no additional windows are available for this device. | |
1020 | * We might be able to reallocate the existing window, | |
1021 | * trading in for a larger page size. | |
1022 | */ | |
1023 | dev_dbg(&dev->dev, "no free dynamic windows"); | |
25ebc45b | 1024 | goto out_restore_window; |
4e8b0cf4 NA |
1025 | } |
1026 | if (query.page_size & 4) { | |
1027 | page_shift = 24; /* 16MB */ | |
1028 | } else if (query.page_size & 2) { | |
1029 | page_shift = 16; /* 64kB */ | |
1030 | } else if (query.page_size & 1) { | |
1031 | page_shift = 12; /* 4kB */ | |
1032 | } else { | |
1033 | dev_dbg(&dev->dev, "no supported direct page size in mask %x", | |
1034 | query.page_size); | |
25ebc45b | 1035 | goto out_restore_window; |
4e8b0cf4 NA |
1036 | } |
1037 | /* verify the window * number of ptes will map the partition */ | |
1038 | /* check largest block * page size > max memory hotplug addr */ | |
1039 | max_addr = memory_hotplug_max(); | |
1040 | if (query.largest_available_block < (max_addr >> page_shift)) { | |
1041 | dev_dbg(&dev->dev, "can't map partiton max 0x%llx with %u " | |
1042 | "%llu-sized pages\n", max_addr, query.largest_available_block, | |
1043 | 1ULL << page_shift); | |
25ebc45b | 1044 | goto out_restore_window; |
4e8b0cf4 NA |
1045 | } |
1046 | len = order_base_2(max_addr); | |
1047 | win64 = kzalloc(sizeof(struct property), GFP_KERNEL); | |
1048 | if (!win64) { | |
1049 | dev_info(&dev->dev, | |
1050 | "couldn't allocate property for 64bit dma window\n"); | |
25ebc45b | 1051 | goto out_restore_window; |
4e8b0cf4 NA |
1052 | } |
1053 | win64->name = kstrdup(DIRECT64_PROPNAME, GFP_KERNEL); | |
1054 | win64->value = ddwprop = kmalloc(sizeof(*ddwprop), GFP_KERNEL); | |
76730334 | 1055 | win64->length = sizeof(*ddwprop); |
4e8b0cf4 NA |
1056 | if (!win64->name || !win64->value) { |
1057 | dev_info(&dev->dev, | |
1058 | "couldn't allocate property name and value\n"); | |
1059 | goto out_free_prop; | |
1060 | } | |
1061 | ||
b73a635f | 1062 | ret = create_ddw(dev, ddw_avail, &create, page_shift, len); |
4e8b0cf4 NA |
1063 | if (ret != 0) |
1064 | goto out_free_prop; | |
1065 | ||
1066 | ddwprop->liobn = cpu_to_be32(create.liobn); | |
1067 | ddwprop->dma_base = cpu_to_be64(of_read_number(&create.addr_hi, 2)); | |
1068 | ddwprop->tce_shift = cpu_to_be32(page_shift); | |
1069 | ddwprop->window_shift = cpu_to_be32(len); | |
1070 | ||
1071 | dev_dbg(&dev->dev, "created tce table LIOBN 0x%x for %s\n", | |
1072 | create.liobn, dn->full_name); | |
1073 | ||
1074 | window = kzalloc(sizeof(*window), GFP_KERNEL); | |
1075 | if (!window) | |
1076 | goto out_clear_window; | |
1077 | ||
1078 | ret = walk_system_ram_range(0, memblock_end_of_DRAM() >> PAGE_SHIFT, | |
1079 | win64->value, tce_setrange_multi_pSeriesLP_walk); | |
1080 | if (ret) { | |
1081 | dev_info(&dev->dev, "failed to map direct window for %s: %d\n", | |
1082 | dn->full_name, ret); | |
7a19081f | 1083 | goto out_free_window; |
4e8b0cf4 NA |
1084 | } |
1085 | ||
79d1c712 | 1086 | ret = of_add_property(pdn, win64); |
4e8b0cf4 NA |
1087 | if (ret) { |
1088 | dev_err(&dev->dev, "unable to add dma window property for %s: %d", | |
1089 | pdn->full_name, ret); | |
7a19081f | 1090 | goto out_free_window; |
4e8b0cf4 NA |
1091 | } |
1092 | ||
1093 | window->device = pdn; | |
1094 | window->prop = ddwprop; | |
1095 | spin_lock(&direct_window_list_lock); | |
1096 | list_add(&window->list, &direct_window_list); | |
1097 | spin_unlock(&direct_window_list_lock); | |
1098 | ||
1099 | dma_addr = of_read_number(&create.addr_hi, 2); | |
1100 | goto out_unlock; | |
1101 | ||
7a19081f JL |
1102 | out_free_window: |
1103 | kfree(window); | |
1104 | ||
4e8b0cf4 NA |
1105 | out_clear_window: |
1106 | remove_ddw(pdn); | |
1107 | ||
1108 | out_free_prop: | |
1109 | kfree(win64->name); | |
1110 | kfree(win64->value); | |
1111 | kfree(win64); | |
1112 | ||
25ebc45b NA |
1113 | out_restore_window: |
1114 | if (ddw_restore_token) | |
a1dabade | 1115 | restore_default_window(dev, ddw_restore_token); |
25ebc45b | 1116 | |
4e8b0cf4 NA |
1117 | out_unlock: |
1118 | mutex_unlock(&direct_window_init_mutex); | |
1119 | return dma_addr; | |
1120 | } | |
1121 | ||
12d04eef | 1122 | static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev) |
1da177e4 LT |
1123 | { |
1124 | struct device_node *pdn, *dn; | |
1125 | struct iommu_table *tbl; | |
954a46e2 | 1126 | const void *dma_window = NULL; |
1635317f | 1127 | struct pci_dn *pci; |
1da177e4 | 1128 | |
f7ebf352 | 1129 | pr_debug("pci_dma_dev_setup_pSeriesLP: %s\n", pci_name(dev)); |
12d04eef | 1130 | |
1da177e4 | 1131 | /* dev setup for LPAR is a little tricky, since the device tree might |
25985edc | 1132 | * contain the dma-window properties per-device and not necessarily |
1da177e4 LT |
1133 | * for the bus. So we need to search upwards in the tree until we |
1134 | * either hit a dma-window property, OR find a parent with a table | |
1135 | * already allocated. | |
1136 | */ | |
1137 | dn = pci_device_to_OF_node(dev); | |
f7ebf352 | 1138 | pr_debug(" node is %s\n", dn->full_name); |
5d2efba6 | 1139 | |
e07102db | 1140 | for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table; |
1635317f | 1141 | pdn = pdn->parent) { |
e2eb6392 | 1142 | dma_window = of_get_property(pdn, "ibm,dma-window", NULL); |
1da177e4 LT |
1143 | if (dma_window) |
1144 | break; | |
1145 | } | |
1146 | ||
650f7b3b LV |
1147 | if (!pdn || !PCI_DN(pdn)) { |
1148 | printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: " | |
1149 | "no DMA window found for pci dev=%s dn=%s\n", | |
74a7f084 | 1150 | pci_name(dev), of_node_full_name(dn)); |
650f7b3b LV |
1151 | return; |
1152 | } | |
f7ebf352 | 1153 | pr_debug(" parent is %s\n", pdn->full_name); |
12d04eef | 1154 | |
e07102db | 1155 | pci = PCI_DN(pdn); |
1635317f | 1156 | if (!pci->iommu_table) { |
7aa241fd | 1157 | tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, |
ca1588e7 | 1158 | pci->phb->node); |
b8c49def | 1159 | iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window); |
ca1588e7 | 1160 | pci->iommu_table = iommu_init_table(tbl, pci->phb->node); |
f7ebf352 | 1161 | pr_debug(" created table: %p\n", pci->iommu_table); |
de113217 | 1162 | } else { |
f7ebf352 | 1163 | pr_debug(" found DMA window, table: %p\n", pci->iommu_table); |
1da177e4 LT |
1164 | } |
1165 | ||
738ef42e | 1166 | set_iommu_table_base(&dev->dev, pci->iommu_table); |
1da177e4 | 1167 | } |
4e8b0cf4 NA |
1168 | |
1169 | static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask) | |
1170 | { | |
1171 | bool ddw_enabled = false; | |
1172 | struct device_node *pdn, *dn; | |
1173 | struct pci_dev *pdev; | |
1174 | const void *dma_window = NULL; | |
1175 | u64 dma_offset; | |
1176 | ||
64ac822f | 1177 | if (!dev->dma_mask) |
4e8b0cf4 NA |
1178 | return -EIO; |
1179 | ||
64ac822f MM |
1180 | if (!dev_is_pci(dev)) |
1181 | goto check_mask; | |
1182 | ||
eb0dd411 NA |
1183 | pdev = to_pci_dev(dev); |
1184 | ||
4e8b0cf4 NA |
1185 | /* only attempt to use a new window if 64-bit DMA is requested */ |
1186 | if (!disable_ddw && dma_mask == DMA_BIT_MASK(64)) { | |
4e8b0cf4 NA |
1187 | dn = pci_device_to_OF_node(pdev); |
1188 | dev_dbg(dev, "node is %s\n", dn->full_name); | |
1189 | ||
1190 | /* | |
1191 | * the device tree might contain the dma-window properties | |
25985edc | 1192 | * per-device and not necessarily for the bus. So we need to |
4e8b0cf4 NA |
1193 | * search upwards in the tree until we either hit a dma-window |
1194 | * property, OR find a parent with a table already allocated. | |
1195 | */ | |
1196 | for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table; | |
1197 | pdn = pdn->parent) { | |
1198 | dma_window = of_get_property(pdn, "ibm,dma-window", NULL); | |
1199 | if (dma_window) | |
1200 | break; | |
1201 | } | |
1202 | if (pdn && PCI_DN(pdn)) { | |
1203 | dma_offset = enable_ddw(pdev, pdn); | |
1204 | if (dma_offset != 0) { | |
1205 | dev_info(dev, "Using 64-bit direct DMA at offset %llx\n", dma_offset); | |
1206 | set_dma_offset(dev, dma_offset); | |
1207 | set_dma_ops(dev, &dma_direct_ops); | |
1208 | ddw_enabled = true; | |
1209 | } | |
1210 | } | |
1211 | } | |
1212 | ||
64ac822f MM |
1213 | /* fall back on iommu ops, restore table pointer with ops */ |
1214 | if (!ddw_enabled && get_dma_ops(dev) != &dma_iommu_ops) { | |
1215 | dev_info(dev, "Restoring 32-bit DMA via iommu\n"); | |
4e8b0cf4 | 1216 | set_dma_ops(dev, &dma_iommu_ops); |
eb0dd411 | 1217 | pci_dma_dev_setup_pSeriesLP(pdev); |
4e8b0cf4 NA |
1218 | } |
1219 | ||
64ac822f MM |
1220 | check_mask: |
1221 | if (!dma_supported(dev, dma_mask)) | |
1222 | return -EIO; | |
1223 | ||
4e8b0cf4 NA |
1224 | *dev->dma_mask = dma_mask; |
1225 | return 0; | |
1226 | } | |
1227 | ||
6a5c7be5 MM |
1228 | static u64 dma_get_required_mask_pSeriesLP(struct device *dev) |
1229 | { | |
1230 | if (!dev->dma_mask) | |
1231 | return 0; | |
1232 | ||
1233 | if (!disable_ddw && dev_is_pci(dev)) { | |
1234 | struct pci_dev *pdev = to_pci_dev(dev); | |
1235 | struct device_node *dn; | |
1236 | ||
1237 | dn = pci_device_to_OF_node(pdev); | |
1238 | ||
1239 | /* search upwards for ibm,dma-window */ | |
1240 | for (; dn && PCI_DN(dn) && !PCI_DN(dn)->iommu_table; | |
1241 | dn = dn->parent) | |
1242 | if (of_get_property(dn, "ibm,dma-window", NULL)) | |
1243 | break; | |
1244 | /* if there is a ibm,ddw-applicable property require 64 bits */ | |
1245 | if (dn && PCI_DN(dn) && | |
1246 | of_get_property(dn, "ibm,ddw-applicable", NULL)) | |
1247 | return DMA_BIT_MASK(64); | |
1248 | } | |
1249 | ||
d24f9c69 | 1250 | return dma_iommu_ops.get_required_mask(dev); |
6a5c7be5 MM |
1251 | } |
1252 | ||
bed59275 SR |
1253 | #else /* CONFIG_PCI */ |
1254 | #define pci_dma_bus_setup_pSeries NULL | |
1255 | #define pci_dma_dev_setup_pSeries NULL | |
1256 | #define pci_dma_bus_setup_pSeriesLP NULL | |
1257 | #define pci_dma_dev_setup_pSeriesLP NULL | |
4e8b0cf4 | 1258 | #define dma_set_mask_pSeriesLP NULL |
6a5c7be5 | 1259 | #define dma_get_required_mask_pSeriesLP NULL |
bed59275 SR |
1260 | #endif /* !CONFIG_PCI */ |
1261 | ||
4e8b0cf4 NA |
1262 | static int iommu_mem_notifier(struct notifier_block *nb, unsigned long action, |
1263 | void *data) | |
1264 | { | |
1265 | struct direct_window *window; | |
1266 | struct memory_notify *arg = data; | |
1267 | int ret = 0; | |
1268 | ||
1269 | switch (action) { | |
1270 | case MEM_GOING_ONLINE: | |
1271 | spin_lock(&direct_window_list_lock); | |
1272 | list_for_each_entry(window, &direct_window_list, list) { | |
1273 | ret |= tce_setrange_multi_pSeriesLP(arg->start_pfn, | |
1274 | arg->nr_pages, window->prop); | |
1275 | /* XXX log error */ | |
1276 | } | |
1277 | spin_unlock(&direct_window_list_lock); | |
1278 | break; | |
1279 | case MEM_CANCEL_ONLINE: | |
1280 | case MEM_OFFLINE: | |
1281 | spin_lock(&direct_window_list_lock); | |
1282 | list_for_each_entry(window, &direct_window_list, list) { | |
1283 | ret |= tce_clearrange_multi_pSeriesLP(arg->start_pfn, | |
1284 | arg->nr_pages, window->prop); | |
1285 | /* XXX log error */ | |
1286 | } | |
1287 | spin_unlock(&direct_window_list_lock); | |
1288 | break; | |
1289 | default: | |
1290 | break; | |
1291 | } | |
1292 | if (ret && action != MEM_CANCEL_ONLINE) | |
1293 | return NOTIFY_BAD; | |
1294 | ||
1295 | return NOTIFY_OK; | |
1296 | } | |
1297 | ||
1298 | static struct notifier_block iommu_mem_nb = { | |
1299 | .notifier_call = iommu_mem_notifier, | |
1300 | }; | |
1301 | ||
bed59275 SR |
1302 | static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node) |
1303 | { | |
1304 | int err = NOTIFY_OK; | |
1305 | struct device_node *np = node; | |
1306 | struct pci_dn *pci = PCI_DN(np); | |
4e8b0cf4 | 1307 | struct direct_window *window; |
bed59275 SR |
1308 | |
1309 | switch (action) { | |
1cf3d8b3 | 1310 | case OF_RECONFIG_DETACH_NODE: |
71cf1def | 1311 | remove_ddw(np); |
7372cfb8 | 1312 | if (pci && pci->iommu_table) |
68d315f5 | 1313 | iommu_free_table(pci->iommu_table, np->full_name); |
4e8b0cf4 NA |
1314 | |
1315 | spin_lock(&direct_window_list_lock); | |
1316 | list_for_each_entry(window, &direct_window_list, list) { | |
1317 | if (window->device == np) { | |
1318 | list_del(&window->list); | |
1319 | kfree(window); | |
1320 | break; | |
1321 | } | |
1322 | } | |
1323 | spin_unlock(&direct_window_list_lock); | |
bed59275 SR |
1324 | break; |
1325 | default: | |
1326 | err = NOTIFY_DONE; | |
1327 | break; | |
1328 | } | |
1329 | return err; | |
1330 | } | |
1331 | ||
1332 | static struct notifier_block iommu_reconfig_nb = { | |
1333 | .notifier_call = iommu_reconfig_notifier, | |
1334 | }; | |
1da177e4 | 1335 | |
1da177e4 LT |
1336 | /* These are called very early. */ |
1337 | void iommu_init_early_pSeries(void) | |
1338 | { | |
a8daac8a | 1339 | if (of_chosen && of_get_property(of_chosen, "linux,iommu-off", NULL)) |
1da177e4 | 1340 | return; |
1da177e4 | 1341 | |
57cfb814 | 1342 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
1ababe11 | 1343 | if (firmware_has_feature(FW_FEATURE_MULTITCE)) { |
1da177e4 LT |
1344 | ppc_md.tce_build = tce_buildmulti_pSeriesLP; |
1345 | ppc_md.tce_free = tce_freemulti_pSeriesLP; | |
1346 | } else { | |
1347 | ppc_md.tce_build = tce_build_pSeriesLP; | |
1348 | ppc_md.tce_free = tce_free_pSeriesLP; | |
1349 | } | |
5f50867b | 1350 | ppc_md.tce_get = tce_get_pSeriesLP; |
12d04eef BH |
1351 | ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeriesLP; |
1352 | ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeriesLP; | |
4e8b0cf4 | 1353 | ppc_md.dma_set_mask = dma_set_mask_pSeriesLP; |
6a5c7be5 | 1354 | ppc_md.dma_get_required_mask = dma_get_required_mask_pSeriesLP; |
1da177e4 LT |
1355 | } else { |
1356 | ppc_md.tce_build = tce_build_pSeries; | |
1357 | ppc_md.tce_free = tce_free_pSeries; | |
5f50867b | 1358 | ppc_md.tce_get = tce_get_pseries; |
12d04eef BH |
1359 | ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeries; |
1360 | ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeries; | |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | ||
1cf3d8b3 | 1364 | of_reconfig_notifier_register(&iommu_reconfig_nb); |
4e8b0cf4 | 1365 | register_memory_notifier(&iommu_mem_nb); |
1da177e4 | 1366 | |
98747770 | 1367 | set_pci_dma_ops(&dma_iommu_ops); |
1da177e4 LT |
1368 | } |
1369 | ||
4e89a2d8 WS |
1370 | static int __init disable_multitce(char *str) |
1371 | { | |
1372 | if (strcmp(str, "off") == 0 && | |
1373 | firmware_has_feature(FW_FEATURE_LPAR) && | |
1374 | firmware_has_feature(FW_FEATURE_MULTITCE)) { | |
1375 | printk(KERN_INFO "Disabling MULTITCE firmware feature\n"); | |
1376 | ppc_md.tce_build = tce_build_pSeriesLP; | |
1377 | ppc_md.tce_free = tce_free_pSeriesLP; | |
1378 | powerpc_firmware_features &= ~FW_FEATURE_MULTITCE; | |
1379 | } | |
1380 | return 1; | |
1381 | } | |
1382 | ||
1383 | __setup("multitce=", disable_multitce); |